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Onlife/node_modules/@noble/ciphers/chacha.js
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2025-04-19 15:38:48 +08:00

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.xchacha20poly1305 = exports.chacha20poly1305 = exports._poly1305_aead = exports.chacha12 = exports.chacha8 = exports.xchacha20 = exports.chacha20 = exports.chacha20orig = void 0;
exports.hchacha = hchacha;
/**
* [ChaCha20](https://cr.yp.to/chacha.html) stream cipher, released
* in 2008. Developed after Salsa20, ChaCha aims to increase diffusion per round.
* It was standardized in [RFC 8439](https://datatracker.ietf.org/doc/html/rfc8439) and
* is now used in TLS 1.3.
*
* [XChaCha20](https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-xchacha)
* extended-nonce variant is also provided. Similar to XSalsa, it's safe to use with
* randomly-generated nonces.
*
* Check out [PDF](http://cr.yp.to/chacha/chacha-20080128.pdf) and
* [wiki](https://en.wikipedia.org/wiki/Salsa20).
* @module
*/
const _arx_js_1 = require("./_arx.js");
const _poly1305_js_1 = require("./_poly1305.js");
const utils_js_1 = require("./utils.js");
/**
* ChaCha core function.
*/
// prettier-ignore
function chachaCore(s, k, n, out, cnt, rounds = 20) {
let y00 = s[0], y01 = s[1], y02 = s[2], y03 = s[3], // "expa" "nd 3" "2-by" "te k"
y04 = k[0], y05 = k[1], y06 = k[2], y07 = k[3], // Key Key Key Key
y08 = k[4], y09 = k[5], y10 = k[6], y11 = k[7], // Key Key Key Key
y12 = cnt, y13 = n[0], y14 = n[1], y15 = n[2]; // Counter Counter Nonce Nonce
// Save state to temporary variables
let x00 = y00, x01 = y01, x02 = y02, x03 = y03, x04 = y04, x05 = y05, x06 = y06, x07 = y07, x08 = y08, x09 = y09, x10 = y10, x11 = y11, x12 = y12, x13 = y13, x14 = y14, x15 = y15;
for (let r = 0; r < rounds; r += 2) {
x00 = (x00 + x04) | 0;
x12 = (0, _arx_js_1.rotl)(x12 ^ x00, 16);
x08 = (x08 + x12) | 0;
x04 = (0, _arx_js_1.rotl)(x04 ^ x08, 12);
x00 = (x00 + x04) | 0;
x12 = (0, _arx_js_1.rotl)(x12 ^ x00, 8);
x08 = (x08 + x12) | 0;
x04 = (0, _arx_js_1.rotl)(x04 ^ x08, 7);
x01 = (x01 + x05) | 0;
x13 = (0, _arx_js_1.rotl)(x13 ^ x01, 16);
x09 = (x09 + x13) | 0;
x05 = (0, _arx_js_1.rotl)(x05 ^ x09, 12);
x01 = (x01 + x05) | 0;
x13 = (0, _arx_js_1.rotl)(x13 ^ x01, 8);
x09 = (x09 + x13) | 0;
x05 = (0, _arx_js_1.rotl)(x05 ^ x09, 7);
x02 = (x02 + x06) | 0;
x14 = (0, _arx_js_1.rotl)(x14 ^ x02, 16);
x10 = (x10 + x14) | 0;
x06 = (0, _arx_js_1.rotl)(x06 ^ x10, 12);
x02 = (x02 + x06) | 0;
x14 = (0, _arx_js_1.rotl)(x14 ^ x02, 8);
x10 = (x10 + x14) | 0;
x06 = (0, _arx_js_1.rotl)(x06 ^ x10, 7);
x03 = (x03 + x07) | 0;
x15 = (0, _arx_js_1.rotl)(x15 ^ x03, 16);
x11 = (x11 + x15) | 0;
x07 = (0, _arx_js_1.rotl)(x07 ^ x11, 12);
x03 = (x03 + x07) | 0;
x15 = (0, _arx_js_1.rotl)(x15 ^ x03, 8);
x11 = (x11 + x15) | 0;
x07 = (0, _arx_js_1.rotl)(x07 ^ x11, 7);
x00 = (x00 + x05) | 0;
x15 = (0, _arx_js_1.rotl)(x15 ^ x00, 16);
x10 = (x10 + x15) | 0;
x05 = (0, _arx_js_1.rotl)(x05 ^ x10, 12);
x00 = (x00 + x05) | 0;
x15 = (0, _arx_js_1.rotl)(x15 ^ x00, 8);
x10 = (x10 + x15) | 0;
x05 = (0, _arx_js_1.rotl)(x05 ^ x10, 7);
x01 = (x01 + x06) | 0;
x12 = (0, _arx_js_1.rotl)(x12 ^ x01, 16);
x11 = (x11 + x12) | 0;
x06 = (0, _arx_js_1.rotl)(x06 ^ x11, 12);
x01 = (x01 + x06) | 0;
x12 = (0, _arx_js_1.rotl)(x12 ^ x01, 8);
x11 = (x11 + x12) | 0;
x06 = (0, _arx_js_1.rotl)(x06 ^ x11, 7);
x02 = (x02 + x07) | 0;
x13 = (0, _arx_js_1.rotl)(x13 ^ x02, 16);
x08 = (x08 + x13) | 0;
x07 = (0, _arx_js_1.rotl)(x07 ^ x08, 12);
x02 = (x02 + x07) | 0;
x13 = (0, _arx_js_1.rotl)(x13 ^ x02, 8);
x08 = (x08 + x13) | 0;
x07 = (0, _arx_js_1.rotl)(x07 ^ x08, 7);
x03 = (x03 + x04) | 0;
x14 = (0, _arx_js_1.rotl)(x14 ^ x03, 16);
x09 = (x09 + x14) | 0;
x04 = (0, _arx_js_1.rotl)(x04 ^ x09, 12);
x03 = (x03 + x04) | 0;
x14 = (0, _arx_js_1.rotl)(x14 ^ x03, 8);
x09 = (x09 + x14) | 0;
x04 = (0, _arx_js_1.rotl)(x04 ^ x09, 7);
}
// Write output
let oi = 0;
out[oi++] = (y00 + x00) | 0;
out[oi++] = (y01 + x01) | 0;
out[oi++] = (y02 + x02) | 0;
out[oi++] = (y03 + x03) | 0;
out[oi++] = (y04 + x04) | 0;
out[oi++] = (y05 + x05) | 0;
out[oi++] = (y06 + x06) | 0;
out[oi++] = (y07 + x07) | 0;
out[oi++] = (y08 + x08) | 0;
out[oi++] = (y09 + x09) | 0;
out[oi++] = (y10 + x10) | 0;
out[oi++] = (y11 + x11) | 0;
out[oi++] = (y12 + x12) | 0;
out[oi++] = (y13 + x13) | 0;
out[oi++] = (y14 + x14) | 0;
out[oi++] = (y15 + x15) | 0;
}
/**
* hchacha helper method, used primarily in xchacha, to hash
* key and nonce into key' and nonce'.
* Same as chachaCore, but there doesn't seem to be a way to move the block
* out without 25% performance hit.
*/
// prettier-ignore
function hchacha(s, k, i, o32) {
let x00 = s[0], x01 = s[1], x02 = s[2], x03 = s[3], x04 = k[0], x05 = k[1], x06 = k[2], x07 = k[3], x08 = k[4], x09 = k[5], x10 = k[6], x11 = k[7], x12 = i[0], x13 = i[1], x14 = i[2], x15 = i[3];
for (let r = 0; r < 20; r += 2) {
x00 = (x00 + x04) | 0;
x12 = (0, _arx_js_1.rotl)(x12 ^ x00, 16);
x08 = (x08 + x12) | 0;
x04 = (0, _arx_js_1.rotl)(x04 ^ x08, 12);
x00 = (x00 + x04) | 0;
x12 = (0, _arx_js_1.rotl)(x12 ^ x00, 8);
x08 = (x08 + x12) | 0;
x04 = (0, _arx_js_1.rotl)(x04 ^ x08, 7);
x01 = (x01 + x05) | 0;
x13 = (0, _arx_js_1.rotl)(x13 ^ x01, 16);
x09 = (x09 + x13) | 0;
x05 = (0, _arx_js_1.rotl)(x05 ^ x09, 12);
x01 = (x01 + x05) | 0;
x13 = (0, _arx_js_1.rotl)(x13 ^ x01, 8);
x09 = (x09 + x13) | 0;
x05 = (0, _arx_js_1.rotl)(x05 ^ x09, 7);
x02 = (x02 + x06) | 0;
x14 = (0, _arx_js_1.rotl)(x14 ^ x02, 16);
x10 = (x10 + x14) | 0;
x06 = (0, _arx_js_1.rotl)(x06 ^ x10, 12);
x02 = (x02 + x06) | 0;
x14 = (0, _arx_js_1.rotl)(x14 ^ x02, 8);
x10 = (x10 + x14) | 0;
x06 = (0, _arx_js_1.rotl)(x06 ^ x10, 7);
x03 = (x03 + x07) | 0;
x15 = (0, _arx_js_1.rotl)(x15 ^ x03, 16);
x11 = (x11 + x15) | 0;
x07 = (0, _arx_js_1.rotl)(x07 ^ x11, 12);
x03 = (x03 + x07) | 0;
x15 = (0, _arx_js_1.rotl)(x15 ^ x03, 8);
x11 = (x11 + x15) | 0;
x07 = (0, _arx_js_1.rotl)(x07 ^ x11, 7);
x00 = (x00 + x05) | 0;
x15 = (0, _arx_js_1.rotl)(x15 ^ x00, 16);
x10 = (x10 + x15) | 0;
x05 = (0, _arx_js_1.rotl)(x05 ^ x10, 12);
x00 = (x00 + x05) | 0;
x15 = (0, _arx_js_1.rotl)(x15 ^ x00, 8);
x10 = (x10 + x15) | 0;
x05 = (0, _arx_js_1.rotl)(x05 ^ x10, 7);
x01 = (x01 + x06) | 0;
x12 = (0, _arx_js_1.rotl)(x12 ^ x01, 16);
x11 = (x11 + x12) | 0;
x06 = (0, _arx_js_1.rotl)(x06 ^ x11, 12);
x01 = (x01 + x06) | 0;
x12 = (0, _arx_js_1.rotl)(x12 ^ x01, 8);
x11 = (x11 + x12) | 0;
x06 = (0, _arx_js_1.rotl)(x06 ^ x11, 7);
x02 = (x02 + x07) | 0;
x13 = (0, _arx_js_1.rotl)(x13 ^ x02, 16);
x08 = (x08 + x13) | 0;
x07 = (0, _arx_js_1.rotl)(x07 ^ x08, 12);
x02 = (x02 + x07) | 0;
x13 = (0, _arx_js_1.rotl)(x13 ^ x02, 8);
x08 = (x08 + x13) | 0;
x07 = (0, _arx_js_1.rotl)(x07 ^ x08, 7);
x03 = (x03 + x04) | 0;
x14 = (0, _arx_js_1.rotl)(x14 ^ x03, 16);
x09 = (x09 + x14) | 0;
x04 = (0, _arx_js_1.rotl)(x04 ^ x09, 12);
x03 = (x03 + x04) | 0;
x14 = (0, _arx_js_1.rotl)(x14 ^ x03, 8);
x09 = (x09 + x14) | 0;
x04 = (0, _arx_js_1.rotl)(x04 ^ x09, 7);
}
let oi = 0;
o32[oi++] = x00;
o32[oi++] = x01;
o32[oi++] = x02;
o32[oi++] = x03;
o32[oi++] = x12;
o32[oi++] = x13;
o32[oi++] = x14;
o32[oi++] = x15;
}
/**
* Original, non-RFC chacha20 from DJB. 8-byte nonce, 8-byte counter.
*/
exports.chacha20orig = (0, _arx_js_1.createCipher)(chachaCore, {
counterRight: false,
counterLength: 8,
allowShortKeys: true,
});
/**
* ChaCha stream cipher. Conforms to RFC 8439 (IETF, TLS). 12-byte nonce, 4-byte counter.
* With 12-byte nonce, it's not safe to use fill it with random (CSPRNG), due to collision chance.
*/
exports.chacha20 = (0, _arx_js_1.createCipher)(chachaCore, {
counterRight: false,
counterLength: 4,
allowShortKeys: false,
});
/**
* XChaCha eXtended-nonce ChaCha. 24-byte nonce.
* With 24-byte nonce, it's safe to use fill it with random (CSPRNG).
* https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-xchacha
*/
exports.xchacha20 = (0, _arx_js_1.createCipher)(chachaCore, {
counterRight: false,
counterLength: 8,
extendNonceFn: hchacha,
allowShortKeys: false,
});
/**
* Reduced 8-round chacha, described in original paper.
*/
exports.chacha8 = (0, _arx_js_1.createCipher)(chachaCore, {
counterRight: false,
counterLength: 4,
rounds: 8,
});
/**
* Reduced 12-round chacha, described in original paper.
*/
exports.chacha12 = (0, _arx_js_1.createCipher)(chachaCore, {
counterRight: false,
counterLength: 4,
rounds: 12,
});
const ZEROS16 = /* @__PURE__ */ new Uint8Array(16);
// Pad to digest size with zeros
const updatePadded = (h, msg) => {
h.update(msg);
const left = msg.length % 16;
if (left)
h.update(ZEROS16.subarray(left));
};
const ZEROS32 = /* @__PURE__ */ new Uint8Array(32);
function computeTag(fn, key, nonce, data, AAD) {
const authKey = fn(key, nonce, ZEROS32);
const h = _poly1305_js_1.poly1305.create(authKey);
if (AAD)
updatePadded(h, AAD);
updatePadded(h, data);
const num = new Uint8Array(16);
const view = (0, utils_js_1.createView)(num);
(0, utils_js_1.setBigUint64)(view, 0, BigInt(AAD ? AAD.length : 0), true);
(0, utils_js_1.setBigUint64)(view, 8, BigInt(data.length), true);
h.update(num);
const res = h.digest();
(0, utils_js_1.clean)(authKey, num);
return res;
}
/**
* AEAD algorithm from RFC 8439.
* Salsa20 and chacha (RFC 8439) use poly1305 differently.
* We could have composed them similar to:
* https://github.com/paulmillr/scure-base/blob/b266c73dde977b1dd7ef40ef7a23cc15aab526b3/index.ts#L250
* But it's hard because of authKey:
* In salsa20, authKey changes position in salsa stream.
* In chacha, authKey can't be computed inside computeTag, it modifies the counter.
*/
const _poly1305_aead = (xorStream) => (key, nonce, AAD) => {
const tagLength = 16;
return {
encrypt(plaintext, output) {
const plength = plaintext.length;
output = (0, utils_js_1.getOutput)(plength + tagLength, output, false);
output.set(plaintext);
const oPlain = output.subarray(0, -tagLength);
xorStream(key, nonce, oPlain, oPlain, 1);
const tag = computeTag(xorStream, key, nonce, oPlain, AAD);
output.set(tag, plength); // append tag
(0, utils_js_1.clean)(tag);
return output;
},
decrypt(ciphertext, output) {
output = (0, utils_js_1.getOutput)(ciphertext.length - tagLength, output, false);
const data = ciphertext.subarray(0, -tagLength);
const passedTag = ciphertext.subarray(-tagLength);
const tag = computeTag(xorStream, key, nonce, data, AAD);
if (!(0, utils_js_1.equalBytes)(passedTag, tag))
throw new Error('invalid tag');
output.set(ciphertext.subarray(0, -tagLength));
xorStream(key, nonce, output, output, 1); // start stream with i=1
(0, utils_js_1.clean)(tag);
return output;
},
};
};
exports._poly1305_aead = _poly1305_aead;
/**
* ChaCha20-Poly1305 from RFC 8439.
*
* Unsafe to use random nonces under the same key, due to collision chance.
* Prefer XChaCha instead.
*/
exports.chacha20poly1305 = (0, utils_js_1.wrapCipher)({ blockSize: 64, nonceLength: 12, tagLength: 16 }, (0, exports._poly1305_aead)(exports.chacha20));
/**
* XChaCha20-Poly1305 extended-nonce chacha.
*
* Can be safely used with random nonces (CSPRNG).
* See [IRTF draft](https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-xchacha).
*/
exports.xchacha20poly1305 = (0, utils_js_1.wrapCipher)({ blockSize: 64, nonceLength: 24, tagLength: 16 }, (0, exports._poly1305_aead)(exports.xchacha20));
//# sourceMappingURL=chacha.js.map
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